Maybe none?: The FCR (flexor carpi radialis) muscle runs from the inside of your elbow down to the base of your thumb. As it's name suggests, it flexes your wrist. Rupture is rare but can occur from chronic inflammation or overuse, rubbing on a bone spur at the wrist or from sudden wrist extension. Repair is not always needed, but wrist flexion strength may be decreased.
Answered 11/24/2014
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